Lowering a load with the cam deactivated - Petzl Sweden

Lowering a load with the cam deactivated


  • Carefully read the Instructions for Use used in this technical advice before consulting the advice itself. You must have already read and understood the information in the Instructions for Use to be able to understand this supplementary information.
  • Mastering these techniques requires specific training. Work with a professional to confirm your ability to perform these techniques safely and independently before attempting them unsupervised.
  • We provide examples of techniques related to your activity. There may be others that we do not describe here.

Before deactivating the cam, it is necessary to install a braking system that allows you to hold the load and control the descent. With the MICRO TRAXION in "simple pulley" mode, a REVERSO on the harness is a good solution.

1. REVERSO installed on the harness

REVERSO installed on the harness

2. Belayer taking the load and deactivating the cam

When the belayer takes the load onto himself, the tension in the rope allows the MICRO TRAXION's cam to be deactivated. Push the button, then release it to hold the cam in the raised position.

Belayer taking the load and deactivating the cam

3. Lowering the load

The descent speed must be moderate, to limit the shock load in case the cam re-activates itself.

This can happen in case of vibrations, the cam pressing against the rock or equipment, or due to rope movements.

Simple haul system

Warning: the pulley at the redirect point significantly reduces friction (about half the friction of a carabiner). In case of jerks during the lower, the belayer can be pulled toward the pulley, especially if their stance is unstable.